Burglar-alarm.



J. B. NASH.

BURGLAR ALARM.

APPLICATION FILED MAR. 20, 1908.

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UNITED srarnsprgrnwr ()FFICE.

JOHN B. NASH, OF LANEVILLE, WEST VIRGINIA.

B UR GLAR-ALARM.

Specification of Letters Patent.

Patented July 6, 1909.

Application filed March 20, 1908. Serial No. 422,307.

Improvements in Burglar-Alarms, of which the following is a specification.

Tins invention relates to burglar alarms,

ment which is adapted to be operated by the opening of doors, windows or the like, with which it has connection, and which will cause an explosive to explode, thus giving out a loud report which will awaken the household and intimidate the burglar.

T 0 this end. the main and primary object of the present invention is to construct an alarm attachment of the character noted which shall dispense with bells and other similar devices apt to become easily disordered, and one which will occupy a small space and can readily be attached to various doors or windows.

With these objects in view the invention resides in the novel construction of elements and their arrangement in operative combination, hereinafter fully described and claimed.

In the accompanying drawings, Figure 1 is a perspective view of a burglar alarm constructed. in accordance with my invention. Fig. 2 is a central longitudinal sectional view of the same.

transverse member 8 is a helical spring 9, which provides means for normally forcing the head 7 of the trigger in a downward direction. The upper extremity of the trigger 6 is provided with an offset member 10, extending upon each side of the trigger and 1 having its free ends provided with eyes 11 5 adapted for the reception of a resilient eleand the object of the invention is to provide l a simple, cheap and efficient alarm attachment 1.2. This element 12 is adapted to be secured upon a door or attached to a window and is adapted to rotate the trigger 6 within its bearings and to cause the transverse mem ber 8 to be rotated away from engagement with the offset 5 of the plate 1, thus causing the trigger 6 to be forced downwardly under the pressure of the spring 9. It is to be understood that when the trigger is set the transverse member 8 is forced against the pressure of the spring 9 and rotated until its end engages the lug or projection 5 upon the plate 1, when the trigger will be held in set position. The offset member 10 is preferably arranged in a right angular direction to the transverse member 8 whereby pressure exerted upon the resilient member 12 will readily rotate the transverse member 8 from its engagement with the offset and allow the downward movement of the trigger 6 under the pressure of the spring 9.

Positioned directly below, and in spaced relation to the floor 1, the plate 1 is provided with an offset 13. This offset 13 is provided 1; with a central aperture adapted for the re- In the accompanying drawings the numeral 1 designates an elongated attaching plate provided with ears 2, having suitable perforations adapted for the reception ofi screws or other securing devices by which the alarm may be positioned at a desired location. The plate 1 is provided with an offset 3 positioned near the upper end. thereof and a corresponding offset 1 positioned. a suitable distance away from the offset 3. Positioned substantially intermediate of these offsets 3 and 4 the plate 1 is provided with a ridge or projection 5,extending across the entire face of the plate. The o'llsets 3 and 4 are provided with openings adapted for the reception of the trigger 6 of the alarm. This trig- 5 cartridge 21, and is provided upon its upper ger 6 is provided upon its lower end beneath the offset 4 with a head 7, and is also provided with a transversely projecting member 8, secured upon the trigger in any preferred or desired manner, and preferably adjustable upon the trigger.

Interposed between the offset 3 and the ception of a hammer 14, positioned directly below the head 7 of the trigger 6. This hammer 1 1 is provided with a head 15, and is also provided with a cut away portion 16, adapted for the reception of a transverse pin 17 provided within the offset 16. This pin 17 serves as a means for limiting the downward movement of the hammer 14 when contacted by the trigger 6.

The plate 1 is provided near its lower end with outwardly extending arms 18. These arms 18 are provided upon their upper, inner edges with suitable channels adapted to act as a guideway for a cartridge receiving block 19. This block 19 is provided with a central opening 20 adapted for the reception. of a face with. an inclined groove communicating with the opening 21, and by which an instrument may be inserted below the rim of the cartridge to withdraw it from the opening 20 after the cartridge has been exploded. The block 19 may be also provided with a suitable handle 21, by which it may be handled and readily positioned upon the arms of the plate or readily withdrawn therefrom as desired.

It is to be understood that a plurality of blocks 19 are to be employed with this invention, each of which being provided with a larger opening 20 whereby difi'erent sizes of I cartridges may be employed.

Having thus fully described the invention what is claimed as new is:

In a burglar alarm, a plate provided with oll'set bearing members and having a transverse lip, a sliding hammer mounted within the lower bearing members of the plate, a spring pressed trigger mounted within the upper bearing members of the plate above and in alinement with the hammer, oflset arms upon the trigger adapted to engage the lip of the plate to secure the trigger from contact with the hammer, the trigger having its upper portion provided with oppositely eX- tending members, a flexible element for one of these members by which the offset member of the trigger is released from the lip to allow the trigger to contact with the shammer, and an explosive below the hammer and adapted to be contacted thereby.

In testimony whereof I aflix my signature in presence of two witnesses.

JOHN B. NASH. \Vitnesses ELIZABETH S. HARMAN, BARBARA A. HARMAN. 

